Numerical Simulation of Oil-water Two-phase Flow in Low Permeability
Reservoirs Considering Well-grid Influence

doi:10. 3863/j. issn. 1674 – 5086. 2013. 05. 011

Abstract

Abstract:

A mathematical model for numerical simulation of 3D water-oil two phase reservoir is established with consideration
of the influence of start-up pressure gradient，and the inner boundary conditions are derived based on the pseudo stable seepage
theory，in the process of which fixed flow pressure，fixed oil production rate and fixed liquid production rate are taken into
consideration. Then by full implicit finite difference scheme，corresponding numerical model is established and solved by
pretreatment conjugate gradient method. The calculation results show that start-up pressure gradient has obvious effect on
pressure field in low permeability reservoirs；in case of fixed oil production，the bigger start-up pressure gradient is，the more
severely pressure changes and the larger pressure drop range is. The effect of well-grid conditions on pressure field is not
obvious，but its effect on well flow pressure is obvious；in case of fixed oil production rate，with the increase of start-up
pressure gradient well flow pressure drops.

Key words: low-permeability reservoirs, well-grid influence, starting pressure gradient, numerical simulation, boundary
conditions

Wang Jianzhong, Yao Jun, Wang Wei. Numerical Simulation of Oil-water Two-phase Flow in Low Permeability
Reservoirs Considering Well-grid Influence[J]. 西南石油大学学报(自然科学版), DOI: 10. 3863/j. issn. 1674 – 5086. 2013. 05. 011.

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